The interest rate is 1.5%
Here, we want to select which of the option represent the interest rate
From the question, we can see that 400 represents the principal, with 4 representing the number of years. Thus, we have 0.015 as the interest rate
What we have to do here however is to convert this to percentage
Mathematically, that would be;
![0.015\text{ = }(15)/(1000)\text{ = }(1.5)/(100)=\text{ 1.5\%}](https://img.qammunity.org/2023/formulas/mathematics/college/4wmfj9afxgz5gkwz4ev3v8fahodllvwfpo.png)